Muscular contraction and muscle types


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Types of muscle contraction

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Muscular contraction and muscle types

  1. 1. Muscular System Types of muscle and types of contraction Lloyd Dean
  2. 2. Recap: Let’s do it again! Team “Oxy” Team “FOG” Team “Bolt” Walk around the 12 press ups Every 10 seconds perform an explosive activity room until told otherwise 1:1 3:1 I shall pick the music! 10:1
  3. 3. SUMMARY OF SKELETAL MUSCLE FIBER TYPES Slow oxidative fibers Myoglobin content Nuclei number Filament organization Type of respiration Speed of contraction Duration of contraction Resistance to fatigue Twitch Function Fast oxidativeglycolytic fibers Fast glycolytic fibers
  4. 4. SUMMARY OF SKELETAL MUSCLE FIBER TYPES Slow oxidative fibers Fast oxidativeglycolytic fibers Fast glycolytic fibers Myoglobin content High High Low Nuclei number Multi nucleated Multi nucleated Multi nucleated Filament organization Striated Striated Striated Type of respiration Aerobic Aerobic and anaerobic Glycolysis Speed of contraction Slow Fast Fast and strong Duration of contraction Long Brief Short Resistance to fatigue High Moderate Low Twitch Slow twitch Fast twitch Fast twitch Function Endurance activities e.g., running a marathon Short periods of intense activity Activities such as sprinting or e.g., strength training or throwing walking uch as sprinting or a javelin walking
  5. 5. Aims By the end of the session you should be able to: Describe the types of muscular contraction State the terms; agonist, antagonist, fixator, synergist Apply the first two aims to a table of various exercises
  6. 6. How do muscles contract?
  7. 7. Activity Complete an exercise of your choice Try and explain what is happening during the movements!
  8. 8. Antagonistic Pairs Biceps – Prime mover Triceps – Antagonistic Biceps – Antagonistic Triceps – Prime Mover This muscle determines the movement of an action –by Contracting This muscle works with the prime mover but creates an opposing action – by relaxing
  9. 9. Agonist, Antagonists and....... Synergists Fixators Help to steady the movement In biceps curl the brachialis helps the action Assist in stabilising the origin of the agonist to ensure movement occurs In biceps curl the fixators would
  10. 10. Muscle contraction Three types Isometric Concentric Eccentric
  11. 11. Isometric Contraction Muscle stays the same length during Contraction or when the activity is being carried out.  Name a sport/activity where isometric contraction occurs?
  12. 12. Concentric Contraction This where the muscle shortens when performing an action  Name a sport/activity where Concentric contraction occurs?
  13. 13. Eccentric Contraction Where the muscle lengthens under tension – ends of the muscle move further away during an action  Name a sport/activity where Eccentric contraction occurs?
  14. 14. Isokinetic Contraction Similar to isotonic in that the muscle changes length during the contraction Isokinetic contractions produce movements of a constant speed (Specialist equipment needed to measure this) Examples of using isokinetic contractions in day-to-day and sporting activities are rare. The best is breast stroke in swimming, where the water provides a constant, even resistance to the movement of adduction.
  15. 15. Time to practice…….
  16. 16. Type of physical activity Agonist Antagonist Synergists   Type of contraction Fixator   Press Up (Upward phase)                                                              Press Up (Downward phased)   Lunge (Downward phase)   Lunge (Upward Phase)   You   You   You     M2 = Explain   D2 = Analyse How could you analyse this table?  What would happen if Usain Bolt did not use fixators or synergists? 
  17. 17. How do muscles contract?
  18. 18. Articulate! Articulate! Articulate! Articulate!